I was working through a bunch of questions. But one of them I could not seem to get my mind across.

Of the main processes in embryogenesis, which begins first?a)Programmed Cell Deathb)Cell differentiation.c)Cell proliferation.d)Cell migration.

I don't think it is programmed cell death, nor cell migration. I am thinking between differentiation and proliferation. I know that zygotes undergo cleavage, and that increases the amount of cells, but does not effect the size overall. So perhaps differentiation?

I am not very sure. I anxiously await for your responses, it's getting on my nerves. Thanks.